A kind of goaf blasting method

Abstract

The embodiment of the invention discloses a goaf blasting method, which relates to the technical field of blasting and is invented for improving the effect of goaf subsidence blasting. The goaf blasting method includes: determining the drilling position of the blast holes according to the number and diameter of the blast holes determined by the size of the goaf and the position of the gob; When the drilling rig drills a predetermined distance from the bottom of the blast hole to the roof of the goaf, the drilling of the blast hole is completed; the engineering plastic casing is put into the blast hole, and the outer wall of the engineering plastic casing is in contact with the blast hole. Inner wall contact; determine the amount of blasting charges according to the determined amount of soil above the roof of the goaf and the lithology of the soil; transport the predetermined amount of blasting charges to the blast hole; connect the detonating cord of the blasting charges As for the detonation controller, the detonation controller is arranged in a safe area away from the blast hole; the detonation charge is detonated by the detonation controller. The invention is suitable for blasting goafs.

Description

technical field [0001] The invention relates to the technical field of blasting, in particular to a goaf blasting method. Background technique [0002] Our country is rich in natural resources, and some resources are not only of various types but also huge in quantity. Usually, such resources are mined underground, and after mining, a goaf will be formed, while some precious mineral resources are stored on the surface , at this time, it is necessary to carry out open-pit mining for such resources. However, in the open-pit mining area, some coal kilns that may exist in the early stage are exploited in an orderly manner, resulting in a large number of goafs that may exist below the open-pit mining area. Due to the existence of goafs There will be potential safety hazards for the operators and equipment above. In order to ensure the normal operation of open-pit mining, it is necessary to carry out subsidence blasting for the goaf. [0003] At present, for the subsidence blasti...

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Problems solved by technology

[0002] Our country is rich in natural resources, and some resources are not only of various types but also huge in quantity. Usually, such resources are mined underground, and after mining, a goaf will be formed, while some precious mineral resources are stored on the surface , at this time, it is necessary to carry out open-pit mining for such resources. However, in the open-pit mining area, some coal kilns that may exist in the early stage are exploited in an orderly manner, resulting in a large number of goafs that may exist below the open-pit mining area. Due to the existence of goafs There will be potential safety hazards for the operators and equipment above. In order to ensure the normal operation of open-pit mining, it is necessary to carry out subsidence and blasting treatment on the goaf

[0003] At present, for the subsidence blasting treatment of the goaf, the specific blasting process such as the amount of blasting chemicals and the setting of blast holes is usually determined based on engineering experience. The effect of blasting in subsidence area is not ideal

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